The ThinkPad 500GB 7200RPM 6Gb/s OPAL1.0 2.5" SATA Hard Drive option provides a robust thin design enabling a seamless upgrade from the primary hard drive of supported ThinkPad laptops. This affordable option provides good storage size along with advanced format and SATA data transfer capabilities. For additional storage and backup, install this drive as a second hard drive using the ThinkPad 9.5mm SATA Hard Drive Bay Adapter IV